In the work the features of generation of the large scale flows in the ionosphere on the background of inhomogeneous non-stationary winds is considered. From the equation of magnetized (modified by the geomagnetic field) Rossby type waves using multi-scale expansion the nonlinear equation of interaction of amplitudes of five different scale modes is obtained. These modes are: ultra low frequency (ULF) primary magnetized Rossby wave, its two satellites, long wavelength zonal mode and large scale background mode (inhomogeneous wind). The effects of nonlinearities (scalar, vector) in formation of the large scale zonal flows by magnetized Rossby waves with finite amplitudes in the dissipative ionosphere is studied. In this case modified parametric approach is used. On the basis of theoretical and numerical analysis of the corresponding system (generalized problem on the eigen values) the new features of energy pumping from comparably small scale ULF magnetized Rossby wave and the background flow into the large scale zonal flows and nonlinear self-organization of collective activity of above mentioned five modes in the ionosphere medium is revealed. Generation of the zonal flow is caused by the Reinolds stress of the magnetized Rossby wave with finite amplitude and effect of the background shear flow. It is shown, that amplitude of the background flow affects the increment of modulation instability and the zonal flow generation. The satellite observation data is also analyzed by means of linear and nonlinear methods.

Project members:

• Khatuna Elbakidze (Principal Investigator)